http://www.supersproxusa.com/ Any info would be great. Also, if not, what rear sprockets are you using? I need to find a good, lighter, 50 tooth rear and chain for my WR250R. Any input on chain preference would be nice to hear as well. Just to verify, we can order a WR250 F sprocket to fit our bikes....correct? Just need to have the additional bolts to fit.